What is a wedding about?
Like the average 15000 squids in debt because of wedding day? Must say all the pomp and circumstance is a bit overrated imho.
Perhaps there is a good balance to be found somewhere? But you need to explain to your OH's family that it is important to you, because of your traditions, to make an effort for the occasion. Bet you can beat wearing a bloody theatre gown and drip- as I did, 2 days after a serious car accident.
Hope you enjoy the day.